Peanut Photosynthesis Under Drought and Re-Watering

Lauriano, J.A.; Ramalho, José C.; Lidon, Fernando C.; Matos, M. do Céu

doi:10.1023/b:phot.0000040567.42444.c2

Cited by 24 publications

(15 citation statements)

References 26 publications

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“…Inconsistent effects of these environmental stresses on physiological depression have been reported in previous studies (e.g. Bhagsari et al, 1976;Nautiyal et al, 1995;review by Reddy et al, 2003;Lauriano et al, 2004). Drought stress also alters the development of leaf area and changes the plant physiology.…”

Section: Introductionmentioning

confidence: 61%

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Hysteresis response of daytime net ecosystem exchange during drought

et al. 2010

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Abstract. Continuous measurements of net ecosystem CO 2 exchange (NEE) using the eddy-covariance method were made over an agricultural ecosystem in the southeastern US. During optimum environmental conditions, photosynthetically active radiation (PAR) was the primary driver controlling daytime NEE, accounting for as much as 67 to 89% of the variation in NEE. However, soil water content became the dominant factor limiting the NEE-PAR response during the peak growth stage. NEE was significantly depressed when high PAR values coincided with very low soil water content. The presence of a counter-clockwise hysteresis of daytime NEE with PAR was observed during periods of water stress. This is a result of the stomatal closure control of photosynthesis at high vapor pressure deficit and enhanced respiration at high temperature. This result is significant since this hysteresis effect limits the range of applicability of the Michaelis-Menten equation and other related expressions in the determination of daytime NEE as a function of PAR. The systematic presence of hysteresis in the response of NEE to PAR suggests that the gap-filling technique based on a nonlinear regression approach should take into account the presence of water-limited field conditions. Including this step is therefore likely to improve current evaluation of ecosystem response to increased precipitation variability arising from climatic changes.

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Section: Introductionmentioning

confidence: 61%

“…clamp-on leaf chambers, (Nautiyal et al, 1995;Bhagsari et al, 1976;Lauriano et al, 2004). There is still a lack of information on a continuous basis on the effect of drought stress on carbon exchange at the canopy scale.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis response of daytime net ecosystem exchange during drought

et al. 2010

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“…The leaf RWC [RWC (%) = (FW – DW/TW – DW) × 100] was determined as in Lauriano et al . (), using ten leaf discs (each 0.5 cm 2 ) punched from the same leaves used for water potential determinations. The fresh weight (FW) was determined immediately after cutting the discs, turgid weight (TW) after overnight rehydration of the discs in a humid chamber at room temperature ( ca .…”

Section: Methodsmentioning

confidence: 99%

Moderate water stress causes different stomatal and non‐stomatal changes in the photosynthetic functioning of Phaseolus vulgaris L. genotypes

et al. 2013

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The impact of moderate water deficit on the photosynthetic apparatus of three Phaseolus vulgaris L. cultivars, Plovdiv 10 (P10), Dobrudjanski Ran (DR) and Prelom (Prel), was investigated. Water shortage had less impact on leaf hydration, RWC (predawn and midday) and predawn water potential in Prel. RWC and Ψ(p) were more reduced in P10, while there was no osmotic adjustment in any cultivar. Although drought drastically reduced stomatal opening in P10 and DR, reduced A(max) indicated non-stomatal limitations that contributed to the negligible P(n). These limitations were on potential thylakoid electron transport rates of PSI and II, pointing to photosystem functioning as a major limiting step in photosynthesis. This agrees with decreases in actual photochemical efficiency of PSII (F(v)'/F(m)'), quantum yield of photosynthetic non-cyclic electron transport (ϕ(e)) and energy-driven photochemical events (q(P)), although the impact on these parameters would also include down-regulation processes. When compared to DR, Prel retained a higher functional state of the photosynthetic machinery, justifying reduced need for photoprotective mechanisms (non-photochemical quenching, zeaxanthin, lutein, β-carotene) and maintenance of the balance between energy capture and dissipative pigments. The highest increases in fructose, glucose, arabinose and sorbitol in Prel might be related to tolerance to a lower oxidative state. All cultivars had reduced A(max) due to daytime stomatal closure in well-watered conditions. Under moderate drought, Prel had highest tolerance, higher leaf hydration and maintenance of important photochemical use of energy. However, water shortage caused appreciable non-stomatal limitations to photosynthesis linked to regulation/imbalance at the metabolic level (and growth) in all cultivars. This included damage, as reflected in decreased potential photosystem functioning, pointing to higher sensitivity of photosynthesis to drought than is commonly assumed.

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“…Usually a significant reduction of photosynthesis of plants under drought stress is detected (Sharkey and Seemann 1989, Lauriano et al 2004, Tezara et al 2005. The reduction of net photosynthetic rate (P N ) of a plant subjected to drought is considered a result of stomatal closure (Sharkey and Seemann 1989, Lal et al 1996, Sánchez-Rodríguez et al 1999) and metabolic impairment (Boyer 1976, Lawlor andCornic 2002).…”

Section: --mentioning

confidence: 99%

Characterization of photosynthesis of Populus euphratica grown in the arid region

Chen

2006

Photosynt.

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Net photosynthetic rate (P N ), stomatal conductance (g s ), intercellular CO 2 concentration (C i ), transpiration rate (E), water use efficiency (WUE), and stomatal limitation (L s ) of Populus euphratica grown at different groundwater depths in the arid region were measured. g s of the trees with groundwater depth at 4.74 m (D 4 ) and 5.82 m (D 5 ) were lower and a little higher than that at 3.82 m (D 3 ), respectively. Compared with C i and L s of the D 3 trees, C i decreased and L s increased at 4.74 m, however, Ci increased and L s decreased at D 5 . Hence photosynthetic reduction of P. euphratica was attributed to either stomatal closure or non-stomatal factors depending on the groundwater depths in the plant locations. P N of the D 3 trees was significantly higher than those at D 4 or D 5 . The trees of D 4 and D 5 did not show a significant difference in their P N , indicating that there are mechanisms of P. euphratica tolerance to mild and moderate drought stress.

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Peanut Photosynthesis Under Drought and Re-Watering

Cited by 24 publications

References 26 publications

Hysteresis response of daytime net ecosystem exchange during drought

Hysteresis response of daytime net ecosystem exchange during drought

Moderate water stress causes different stomatal and non‐stomatal changes in the photosynthetic functioning of Phaseolus vulgaris L. genotypes

Characterization of photosynthesis of Populus euphratica grown in the arid region

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